It was stated in the introduction that quantum mechanics can be expressed in terms of quantum hydrodynamic variables, namely the probability density and the momentum field, even though the two formulations are not equivalent as certain hydrodynamical solutions may not satisfy the Schrödinger equation. The inhomogeneous continuity equation for the probability density is analogous to the conservation of mass equation in fluid mechanics. It is possible to derive an equation analogous to the momentum Navier equation [1]}, [2]}, [3]}. Employing (4) we find the continuity equation for the flux momentum
\(\frac{\partial (\rho \mathbf {v})}{\partial t}+\nabla ( \rho \mathbf {v}\mathbf {v})-\rho \frac{d\mathbf {v}}{dt}=-\frac{2\varepsilon }{m\hbar } \rho Q\mathbf {v},\) 
